<h1>AMSS technical failure disrupts busiest international airport, delays 800+ flights, about 20 cancellations, controllers using manual flight plans</h1> A technical failure in the Automatic Message Switching System (AMSS) that supports air traffic control data at the country's busiest international airport caused widespread disruption, delaying over 800 arrivals and departures and prompting about 20 cancellations. The state air navigation authority and the airport operator reported that the fault, which had intermittent signs over two days, began significantly affecting operations early morning; air traffic controllers are reverting to time-consuming manual flight-plan preparation, creating congestion and long passenger queues. Multiple carriers and airport teams are working to restore automated systems and normalise flight operations.